Germany Sempell seals Sempell model Sempell price

Sempell seals are materials or components that prevent leakage of fluids or solid particles from adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The storage room temperature for seals should preferably be below 30°C to avoid high-temperature aging. Seals can be divided into two main categories: static seals and dynamic seals. Their primary function is to prevent leakage of fluids or solid particles from adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery components or measures. Static sealing refers to the tight closure of sealed chambers and containers, used for sealing letters and wills with stamps.

Sempell seal classification

1) Packing seal: The packing seal features a simple structure, low cost, and easy maintenance. However, it has high leakage volume and significant power loss. Therefore, packing seals are used for conveying general media, such as water; they are generally not suitable for petroleum and chemical media, especially for valuable, flammable, explosive, or toxic media. 2) Mechanical seal: A mechanical seal (also known as a face seal) provides good sealing performance with minimal leakage and long service life, but it is expensive and has higher requirements for machining, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for conveying petroleum and chemical media and can be used for media with various viscosities, strong corrosiveness, and solid particles. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 3) Dynamic seal: Dynamic seals can be divided into two types: back-vane seals and auxiliary impeller seals. During pump operation, the centrifugal force of the back vanes (or auxiliary impeller) reduces the pressure of the medium at the shaft seal to atmospheric or negative pressure, preventing leakage during use. When the pump stops, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this point, the shutdown sealing device provides the sealing function. Packing seals are commonly used as the shutdown sealing device paired with back-vane (or auxiliary impeller) seals. Packing seals come in two types: standard type and mechanically adjustable tension type. Standard packing seals are similar to those in general packing-sealed pumps and require maintaining a slight positive pressure at the shaft seal to avoid dry friction of the packing. Mechanically adjustable tension packing seals use counterweights to loosen the packing during pump operation and tighten it when the pump stops. Dynamic seals offer reliable performance, low cost, and easy maintenance, making them suitable for conveying media with a high content of solid particles, such as slurry pumps and ore pulp pumps in the phosphate industry. The disadvantages are greater power loss compared to mechanical seals and shorter service life of the shutdown sealing device. The seal between the rotating pump shaft and the stationary pump casing is called the shaft seal. Its function is to prevent high-pressure liquid from leaking out along the shaft or outside air from infiltrating along the shaft. For centrifugal pumps, the shaft seal is a type of dynamic seal. Depending on whether the sealing surfaces are in contact, dynamic seals can be classified as contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device contacts the shaft, resulting in relative friction between the two. Contact dynamic seals include packing seals and mechanical seals.

Sempell seal operation

1) If slight leakage occurs after the pump starts, observe for a period of time. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. 2) The operating pressure of the pump should be stable, with pressure fluctuations not exceeding 1 kg/cm². 3) During pump operation, avoid cavitation to prevent dry friction of the sealing surfaces and seal damage. 3) Regularly check the sealing condition. During operation, if leakage exceeds the standard, heavy oil shall not exceed 5 drops/min, and light oil shall not exceed 10 drops/min. If there is no improvement trend within 2-3 days, stop the pump to inspect the sealing device.

Sempell seal precautions

1) Shaft speed: due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals. Low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: in cases of higher operating temperatures, select polyacrylate or silicone, fluorine, or silicone-fluorine rubber. Measures should be taken to lower the oil temperature in the tank. In cases of lower operating temperatures, select cold-resistant rubber. (3) Pressure: general oil seals have poor pressure resistance; excessive pressure will cause deformation. Under conditions of excessive pressure, use pressure-resistant support rings or reinforced pressure-resistant oil seals. 4) Installation eccentricity: if the eccentricity between the oil seal and the shaft is too large, sealing performance will deteriorate, especially at high shaft speeds. If the eccentricity is too large, oil seals with a "W" shaped cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; i.e., higher shaft finish results in longer oil seal life. 6) Ensure a certain amount of lubricating oil is present at the lip of the oil seal. 7) Pay special attention to preventing dust from entering the oil seal.

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